Turn on the first for one min and then turn it off. Q' x( l: Y5 q0 s! q0 V
Turn on the 2nd for five min and then turn it off. 6 b/ p& d4 R" i9 c& @1 mTurn on the 3rd and leave it on. & U; A, {" i7 p! HAnd then go upstairs right away.% L( B" o( \) N: G1 C) u5 R
* h# \7 H4 [ y0 r0 MFind the answer by using your fingers and eyes# x0 }9 |* A. {, [+ [
这只是一个智力问题,不象是电工问题。
原帖由 老警察 于 2009-1-16 07:12 发表 9 k# t5 e- Y6 A% `Turn on the first for one min and then turn it off. / w- ]. u, f& X: U4 `; ITurn on the 2nd for five min and then turn it off.- L2 x. L* \$ Z% A' [
Turn on the 3rd and leave it on. 6 X0 L" V; w: _: @; j" D8 OAnd then go upstairs right away. . y0 ` n, F. v# T+ S9 t% u# _' S/ Z/ }0 t) P# p
Find the answer by using ...